Some questions about mail app

hi all

I found some problems when using the mail app, so I couldn’t send and receive emails normally.

nc version: 28.01
mail version: 3.5.6

The following is the email configuration:

When sending an email, the reminder fails to send.

The following is the system log description

TypeError
OCA\Mail\IMAP\MailboxStats::__construct(): Argument #1 ($total) must be of type int, null given, called in /Volumes/data/web/beta.nextcloud.ebf.cc/apps/mail/lib/IMAP/FolderMapper.php on line 147
Could not load account mailboxes: OCA\Mail\IMAP\MailboxStats::__construct(): Argument #1 ($total) must be of type int, null given, called in /Volumes/data/web/beta.nextcloud.ebf.cc/apps/mail/lib/IMAP/FolderMapper.php on line 147
Exception
OCA\Mail\Controller\DraftsController::update(): Argument #2 ($accountId) must be of type int, null given, called in /Volumes/data/web/beta.nextcloud.ebf.cc/lib/private/AppFramework/Http/Dispatcher.php on line 230 in file '/Volumes/data/web/beta.nextcloud.ebf.cc/apps/mail/lib/Controller/DraftsController.php' line 155

Very much looking forward to your help, thank you

I found this open issue. Maybe @ChristophWurst can help you.

thank you ~~~